STM32L496QGI3STR datasheet(24/263 Pages) STMICROELECTRONICS

24 / 263 page

Functional overview

STM32L496xx

24/263

DocID029173 Rev 2

Figure 3. Power supply overview

3.10.2

Power supply supervisor

The device has an integrated ultra-low-power brown-out reset (BOR) active in all modes

except Shutdown and ensuring proper operation after power-on and during power down.

The device remains in reset mode when the monitored supply voltage VDD is below a

specified threshold, without the need for an external reset circuit.

The lowest BOR level is 1.71V at power on, and other higher thresholds can be selected

through option bytes.The device features an embedded programmable voltage detector

(PVD) that monitors the VDD power supply and compares it to the VPVD threshold. An

interrupt can be generated when VDD drops below the VPVD threshold and/or when VDD is

higher than the VPVD threshold. The interrupt service routine can then generate a warning

message and/or put the MCU into a safe state. The PVD is enabled by software.

In addition, the device embeds a Peripheral Voltage Monitor which compares the

independent supply voltages VDDA, VDDUSB, VDDIO2 with a fixed threshold in order to ensure

that the peripheral is in its functional supply range.

STM32L496QGI3STR Datasheet(PDF) 24 Page - STMicroelectronics